getting to grips with CAT II CAT III operations(20)

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3.3.5 FAILURES AND ASSOCIATED ACTIONS
GENERAL
In general there are three possible responses to the failure of any system, instrument or element during the approach.
. CONTINUE the approach to the planned minima.
. REVERT to higher minima and proceed to a new DH
(above 1000ft).
. GO AROUND and reassess the capability.
The nature of the failure and the point of its occurrence will determine which response is appropriate.
As a general rule, if a failure occurs above 1000ft AGL the approach may be continued reverting to a higher DH, providing the appropriate conditions are met (refer to "DOWNGRADING CONDITION").
Below 1000ft (and down to AH when in CAT III DUAL) the occurrence of any failureimplies a go-around, and a reassessment of the system capability. Another approach may then be undertaken to the appropriate minima for the given aircraft status.
It has been considered that below 1000ft, not enough time is available for the crewto perform the necessary switching, to check system configuration and limitations and brief for minima.
In CAT III DUAL, in general, a single failure (for example one AP failure or one
engine failure) below AH does not necessitate a go-around.
But a go-around is required if the autoland warning is triggered.

ABNORMAL PROCEDURES
The required procedures following failures during CAT II or CAT III approaches are provided in the Approved Flight Manual (AFM). These procedures have been established and approved during the aircraft CAT Il / CAT III certification.
It has been found that a simplification of the AFM abnormal procedures wasdesirable for actual operation. Therefore, these simplified abnormal procedures, which are necessarily more conservative, are published in the FCOM. Operators may always refer to AFM for detailed information if they want to develop their own abnormal procedures.
The abnormal procedures can be classified into two groups
1.  
Failures leading to a downgrading of capability as displayed on FMA and ECAM with an associated specific audio warning (triple click).

2.  
Failures that do not trigger a downgrading of capability but are signaled byother effects (Flag, ECAM warning, amber caution and associated audio warnings).

It should be noted that some failures might trigger ECAM warnings, cautions and a downgrading of capability.
The FCOM describes what should be the crew responses to failures in function to the height.
Above 1000ft:
* DOWNGRADING CONDITIONS
a)  Downgrading from CAT 3 to CAT 2 is permitted only if
. ECAM actions are completed,
. RVR is at least equal to CAT II minima,
. Briefing is amended to include CAT II procedure and DH.
. Decision to downgrade is completed above 1000ft AGL,
b)  Downgrading from CAT 2 to CAT 1 permitted only if
. ECAM actions are completed,
. at least one FD is available,
　
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